teddy81

urgreathero

as soon as u pull in clutch it dose iti thought it was the 45 pilot jet so i put in a new fuel screw and a 48 pilot jetbut it does it worse nowits dun it ever sense i baught the bikefirst bike i had that did this

teddy81

do you fill it to the top? radiators have a tendency to settle where they like, i would fill mine up an everytime i would check it would be down then i stopped filling it and it stayed right at the same spot.

urgreathero

do you fill it to the top? radiators have a tendency to settle where they like, i would fill mine up an everytime i would check it would be down then i stopped filling it and it stayed right at the same spot.

ya i didit just shoots it out like crazyi dunno whyfirst bike i got that has had this probcould it be the radiator or sumthens bad?its a brand new 07

urgreathero

RocketScientist

Don't worry, it's normal. When the coolant heats up, it expands and takes up more room. If you fill it up full when it's cold, the bike will spit out the excess as it gets warm. Most vehicles have a tank to catch the excess (called an overflow tank). When the engine cools, the coolant gets sucked back into the radiator. MX bikes don't have an overflow tank and will spit out the excess. The rediator doesn't have to be 100% full but you should be able to see coolant as you look in. Just check it every once in a while.

Remember, the bike doesn't have a radiator fan. This means if you stop and let it idle for long periods of time, the engine will overheat. You must keep moving to keep airflow through the radiator.

urgreathero

Don't worry, it's normal. When the coolant heats up, it expands and takes up more room. If you fill it up full when it's cold, the bike will spit out the excess as it gets warm. Most vehicles have a tank to catch the excess (called an overflow tank). When the engine cools, the coolant gets sucked back into the radiator. MX bikes don't have an overflow tank and will spit out the excess. The rediator doesn't have to be 100% full but you should be able to see coolant as you look in. Just check it every once in a while.

Remember, the bike doesn't have a radiator fan. This means if you stop and let it idle for long periods of time, the engine will overheat. You must keep moving to keep airflow through the radiator.

RocketScientist

Ok, if it is dumping that much out, check the radiator cap. The cap has 2 seals on it. The smaller inner seal should not be damaged in any way. The inner seal is spring loaded and should be able to get contact with the surface inside the radiator fill hole.

The radiator cap is designed to hold pressure on the coolant system. The extra pressure raises the boiling point of the coolant. If the coolant does not pressurize, it is guaranteed that the coolant will boil and dump out. Most MX bikes have the same size and pressure rated radiator caps. Try borrowing one from another bike.

urgreathero

Ok, if it is dumping that much out, check the radiator cap. The cap has 2 seals on it. The smaller inner seal should not be damaged in any way. The inner seal is spring loaded and should be able to get contact with the surface inside the radiator fill hole.

The radiator cap is designed to hold pressure on the coolant system. The extra pressure raises the boiling point of the coolant. If the coolant does not pressurize, it is guaranteed that the coolant will boil and dump out. Most MX bikes have the same size and pressure rated radiator caps. Try borrowing one from another bike.